Multiple motor drive



076i? 91951 E. o. WANGERIN EI'AL 7 801 MULTIPLE MOTOR DRIVE Filed Dec.23, 1948 Fig.3.

W & 0w m m A ER w F 0 w y w 8 m 3 Q Md, 2% w .nw mw Patented Oct. 16,1951 MULTIPLE MOTOR DRIVE Elmer 0. Wangerin and Robert W. Wetherald,Rochester,-N. Y., assignors to Eastman Kodak Company, Rochester, N. Y.,a corporation of New Jersey Application December 23, 1948, Serial No.67,012

7 Claims. 1

This invention relates to a motor drive and more particularly to amultiple motor drive for driving a common drive shaft at a predeterminedspeed and at any one of several other speeds less than saidpredetermined speed.

In the winding and reeling of a strip or web of material from a supplysource to a take-up source, it is often advantageous to be able to windat a high rate of speed and also at a low rate of speed for the purposeof inspection, grading, etc. In many instances a single motor with arheostat control accomplishes the desired result. However, in caseswhere the strip or web of material even when being moved at a low speedmust be arrested instantaneously and in which there must be a veryminimum of coasting of the material past a fixed point or station, arheostatcontrolled motor is very impractical.

The embodiment of the present invention .is illustrated in connectionwith the moving of a film strip past a fixed station at any one ofseveral speeds. More particularly the invention is embodied in a filmreader in which the desired image on a film strip is projected onto ascreen and in which the motor drive is utilized to move the film stripat any one of several speeds for scanning the images projected on ascreen and at a much faster rate for moving the section of the filmstrip to be scanned toward the projecting position. In a film reader, asis well known, the film strip may be moved continuously past theprojecting station with the operator scanning the moving images on thescreen and is stopped when the desired image to be viewed appears on thescreen. The number of images projected on the screen for viewing dependson the magnification of the reader and the size of the document image.It can be readily appreciated that if the document is relatively largeonly a single image may appear on the screen and it will be necessaryfor the film drive to be arrested instantaneously in order to preventthe image from coasting off the screen.

In the present invention the film drive for the supply and take-up reelsis driven from a common shaft which may be driven by either of twomotors. One motor drives the common shaft at a predetermined speed, orhigh speed, which is used for rapidly moving the film strip from onereel to the other and for bringing the section of film to be scannedinto the projecting position. The second motor drives the film stripthrough a clutch means on the rotor of the first motor at one of twospeeds for scanning the projected document images. When the first motoris energized, the second motoris disconnected therefrom, and

' when the second motor is deenergized it is released from the rotor ofthe first motor so that no coasting of the drive results. Hence, thefilm strip does not coast, and the document image to be viewed on thescreen is not moved off the screen.

The primary object of the invention, therefore, is to provide a multiplemotor drive for a common drive shaft whereby said shaft may be driven ata predetermined speed by one motor and at any one of several speeds by asecond motor.

Another object of the invention is to provide a multiple motor drive fora common drive shaft in which one of said motors drives said shaft at apredetermined speed and a second motor drives said shaft through therotor of said first-mentioned motor at a speed different from thepredetermined speed of the first motor.

Yet another object of the invention is to provide a multiple motor drivefor a common drive shaft in which one of said motors drives said shaftat a predetermined speed and a second motor when energized is coupled tothe rotor of said first-mentioned motor for driving said shaft at a lowand an intermediate speed both of which are less than the predeterminedspeed of said first motor.

Still another object of the invention is to provide a multiple motordrive for a common drive shaft in which a control means successivelyenergizes one motor to drive said shaft through the rotor of the othermotor at a low and then an intermediate speed and then energizes asecond motor to drive said shaft at a predetermined speed.

And yet another object of the invention is to provide a multiple motordrive for a common shaft in which one of the motors when energized iscoupled to the rotor of the other motor and is uncoupled when the othermotor is energized.

These and other objects and advantages Will be apparent to those skilledin the art by the description which follows:

The above-mentioned and other objects of the invention are embodied in afilm strip drive for a film reader in which the drive for both thesupply reel and the take-up reel is taken from a common drive shaft andwhich comprises a first motor operatively connected to said drive shaftand which upon energization is adapted to rotate said shaft at apredetermined speed, a second motor including a plurality of resistancesin series circuit with the armature and field winding and adapted uponenergization to rotate said shaft at any one of several speeds less thanthe predetermined speed of said first motor, clutch means for couplingsaid second motor to the rotor of said first motor, holding meansincluding a solenoid for maintaining said clutch means in an engagedposition upon energization of said second motor, a centrifugallyoperated means on I the rotor of said first motor for deenergizing saidsolenoid upon energization of said first motor, and a control meansincluding a plurality of switches adapted to be successively actuatedfor energizing said second motor at a low speed and an intermediatespeed and said first motor at said predetermined speed. Thus, thepresent invention is not to be limited by the illustrated embodimentthereof but has a scope as broad as the interpretation of the claimspermit.

Reference is now made to the accompanying drawing wherein similarreference characters designate similar elements and wherein:

Fig. 1 is a plan view showing the arrangement of the motor drive and theapplicationof the drive for moving a film strip through a projectingstation as in a film reader; V

Fig. 2 is a partial end view showing the driving connection between thesecond motor and the gear member on the rotor of the first motor;

Fig. 3 is a partial vertical section showing the arrangement formounting the clutch means and the centrifugally-operated switchactuating means on the rotor of the first motor; and

Fig. 4 is a wiring diagram of the motor circuits and their applicationin conjunction with the elements of the film reader shown in Fig. 1.

Although the illustrated embodiment of the invention is disclosed inconjunction with a film reader, it is to be understood that the featuresof the invention are not necessarily limited to a film reader. It isentirely within the scope of the invention to provide a take-off fromthe common drive shaft to almost any type of mechanism which is to bedriven at several speeds and which must be arrested within very smalllimits when both motors are deenergized.

As stated above, the illustrated embodiment of the invention isdisclosed in conjunction with a conventional film reader in which thefilm strip is moved from a supply reel l8, over a guide roller ii,through the projecting station as defined by the rotating glass flatsI2, around the guide rollers l3 and it, and then wound up on the core ofthe take-up reel I5. The images on the film strip, as it is movedbetween the rotating flats i2, are illuminated by the lamp l6 and thecondenser lens system If, and the projection lens |8 directs the imagetoward a, mirror which, in turn, directs the image onto the rear surfaceof a screen in a well-known manner.

The reels l5 and I5 are driven in the same direction from suitablesprockets or pulleys I9 on the shaft of the roller Hi and are connectedby the chains or belts 25 and 2| to the sprockets or pulley 22 and 23 onthe shafts of the reels I and I5, respectively, An adjustable sprocketor pulley 2s may be provided to obtain the proper tension on the belt20. It will be readily appreciated that the shaft for the roller l4 mustbe provided with three sprockets, one for driving the reel IS, a secondfor driving the reel l and a third for connecting the film drive to themultiple motor drive, designated broadly by the numeral 25. The thirdsprocket is connected by the chain 26 to a sprocket 21 on the commondrive shaft 28.

The common drive shaft 28 i driven by either of the motors 29 or 30depending on the speed at which said shaft is to be driven. Both motorsare mounted on the common plate 3| by means of the brackets 32 and 33.The first or high speed motor 29 is provided with a worm gear 3 3 fixedto the extension 35 of its rotor for engaging the worm wheel 36 on theshaft 28. The motor 29, therefore, when energized, drives the shaft 28at a speed determined by the ratio between the worm 34 and the wormwheel 35 with respect to the rated speed of the motor. Once this ratiobetween the gears is determined, the speed at which the shaft 28 isdriven by the motor 29 becomes the predetermined speed.

The motor 38 is mounted at a right angle to the motor 29 and is inclinedat an angle with respect to the horizontal, as shown in Fig. 2. Therotor of the motor 29 is provided with a long extension 31 on the sideof the motor opposite the worm 34 and has fixed thereto a clutch member38. A gear 39 is secured to a ring 40 loosely mounted on the sleeve 4|which is fixed to the extension 3?. The gear 39 is provided with aclutch face 42 which is a friction material fixed to said gear and whichis adapted to engage a similar material on the clutch member 33. Themotor 39 is provided with a worm gear 53 which meshes with the gear 39.The bearing M which is mounted on the sleeve 4|, see Fig. 3, has itsouter race mounted in a ring 45 having a slotted end portion 45 forreceiving the arm 5: 1.

The holding means for maintaining theclutch member 38 and the clutchface 42 of the gear 39 in an engaged position comprises a solenoid 43mounted on the top of the bracket 32 and link 49 connecting the armatureof the solenoid with the arm ll. When the second or low and intermediatespeed motor 30 is energized, the solenoid 3 is energized and as thearmature and link G9 are moved to the left, as viewed in Fig. 1, the armM, which is pivotally mounted in the plate 3|, moves the ring 45 and thegear 39 axially along the extension 3? so that the face 12 engages theclutch member 38 to drive the shaft 28 through the rotor of the motor 29at one of several speeds less than the predetermined speed by which themotor 29 drives the shaft 28. The spring 50 normally holds the clutchmember 38 and the clutch face '42 of the gear 39 in a disengagedposition and when the motor 30 is deenergized it returns said parts 'totheir normal position.

The centrifugally-operated means on the rotor of the motor 29 comprisesa switch-actuating member 5| Which is maintained in an outward orswitch-actuating position by the spring 52, an arcuate plate 53 which issecured to a sleeve 5| fixed to the extension 37, and a plurality ofarms 55 which normally hold the actuating member 5| in a predeterminedposition with respect to the switch 55. The arms 55 are arranged inpairs, one pair being on each side of the extension 31 and connected bythe rollers 51 which engage the plate 53. In the position shown in Figs.1 and 3, thenormally open switch 58, which is mounted on the bracket 58secured to the plate 3 I, is held in its closed position by the member5|. When the motor 35 is energized the centrifugally-operated meansrotates but remains fixed axially and the switch 56 is held closed.However, when the motor 29 is energized and since it rotates theextension at a higher speed than the motor 39, the arms 55 moveoutwardly to move the member 5| axially toward the plate 53 to allow theswitch 55 to open for a purpose to be described hereinafter.

The control means 12 for supervising the-energlzation of said motorscomprises a receptacle which houses the forward switch I3, the reverseswitch 14, the low speed switch I5, the intermediate speed switch I8 andthe high speed switch 71, all of said switches being actuated in asequence to be described by either the forward speed control arm F orthe reverse speed control arm R. The operation of control means I2 forthe multiple motor drive will be best understood in connection with thedescription of the wiring diagram shown in Fig. 4. The switches I3 andI4 are of the double-pole type having a pole of each connected by theline I8 which is connected to the main 88. The other pole of the switchI3 is dead while the other pole of the switch I4 is connected by theline I9 to the reversing relay 88 and the main 8 I. The contact membersof the switches I3 and I4 are connected together bythe line 8| which, inturn, is connected by the line 82 to the contact member of the switch H.The switch 11 is also of the double pole type having one pole connectedto the contact member of the switch I5 by the line 83, and the otherpole connected to the armature 84 of the motor 29 by the line 85. Theswitch 15 is of the single pole type and has its pole connected to thecontact member of the switch I8 by the line 88, the line 88 beingconnected by the line 81 to one side of the rectifier 88 which in turnhas the other side connected by the line 89 to the main 8|. The outputside of the rectifier 88 is connected on one side by the line 98 to thesolenoid 48 and the pole of the switch 58 and on the other side by theline 91 to the contact member of the switch 58. The switch I8 is also ofthe single-pole type and has its pole connected by the line 98 and anadjustable resistance 9| to the armature 92 of the motor 38. Anadjustable resistance 93 and a fixed resistance 94 are connected in theline 95 connecting lines 89 and 9|.

The armature 92 of the motor 38 is connected in series circuit with thefield coil 98 by the line 99, and the coil, in turn, is connected to themain 8| by the line I88. In a like manner, the armature 84 of the motor29 is connected in series circuit with the field coil IN by the lineI82, and the coil, in turn, is connected to the main 8| by the line I83.It will be noted from Fig. 4 that the field coil and aramature circuitseach contain four switches. These switches or pairs of contacts areactuated by the reversing relay 88 and are designated as 88' for thosewhich are normally closed and 88" for those which are normally open.

Upon depressing the arm F, the switch I3 and the switch I5 are actuatedsimultaneously, the switch I3 being moved to its dead contact, so thatthe flow of current is from the main 88 through the line I8, the switchI4, the line 8|, the line 82, switch 11 in the position shown in Fig. 4,line 83, switch I5, line 88, line 81, resistances 93, 94, and 9|,armature 92, line 99, contacts 88', field coil 98, contacts 88', andline I88 to main 8|. At the same time, the current flow continuesthrough line 8! to the rectifier 88 and the line 89 to the main 8|.Since in this circuit the motor 38 is energized at low speed the switch58 will be held closed and solenoid 48 will be energized by D. C.current flowing from the rectifier 88 through lines 98 and 91 to movethe clutch face 42 axially into engagement with the clutch member 38. Itwill be noted that when switch I5 is closed, the current flow is throughthe three resistances so that the current flow to the armature 92 andthe-coil 98 is at a Upon depressing the arm F to its next position, theswitch 18 is closed and the switches I3 and I5 are maintained in theiractuated position described above. However, instead of the current flowbeing through the resistances 93 and 94, it is now through the line 98and only the resistance 9|. This second position of the arm F allowsmore current to flow to the armature 92 and the coil 98 so that themotor rotates at an increased or intermediate speed. Since this speed isnot sufficient to cause the arms 55 to move the actuating member 5|axially, the switch 58 remains closed and the solenoid 48 continues tohold the clutch face 42 and the clutch member 38 is in the engagedposition. With the arm F in either of these two positions, the motor 28is not energized and the motor 38, through the worm 43, the gear 39, andthe clutch face 42, drives the common shaft 28 through the rotor of themotor 29.

When the arm F is depressed to its third position, the switch I3 remainsdead, the switch 11 is actuated to its other pole, and the switches I5and I8 are opened. With the actuation of switch 11 to its other pole,the current flow is through the line 85 to the armature 84, the lineI82, contacts 88' coil I8 I, contacts 88 and line I83 to the main 8|.Since the switches I5 and I8 have been opened, the solenoid 48 isdeenergized and the spring 58 returns the gear 39 and its clutch face 42to its normal disengaged position so that the motor 29 drives the commonshaft 28 at a high speed entirely disengaged from the motor 38. With therotor of the motor 29 revolving at high speed, the arms 55 are movedoutwardly and the member 5I is moved axially to the left to allow theswitch 58 to move to its normally open position. Upon releasing the armF, the above-described circuits are energized in a reverse order, thatis, the switch 1! is moved to its original pole and the switches I5 andI8 are closed to energize the motor 38 at its intermediate speed, andthe switch I8 is opened to energize the motor 38 at its low speed. Asthe arm F is moved from the third to the second position, the clutchmember 38 is not engaged until the rotor of the motor 29 decreases inspeed to permit the member 5| to again close the switch 58 forenergizing the solenoid 48.

Since the rotor of the motor 29 is driven at relatively low speeds ineither of the first two positions of the arm F, the releasing of saidarm to stop the drive is practically instantaneous due to the releasingof the clutch means. As a result, any coasting on the part of the rotorof the motor 38 is not transmitted to the rotor of the motor 29. Byproviding a dead contact for the switch I3, a safety measure isintroduced which prevents energization of either motor in the event theoperator intentionally or inadvertently moves both the arms F and R atthe same time. If this should happen, the switch I3 is moved to its deadcontact and switch I4 is moved to its contact in the line I9 so thatboth motor circuits are rendered inoperative.

The control actuating arm R is operated for reversing the direction ofrotation of the common drive shaft 28. When the arm R is depressed toany of its three positions, the switch I3 is closed and the switch I4 ismoved to its other pole. When the contact member of the switch 14engages its other pole, the reversing relay 88 is connected to the mainGI by the line I9 for opening the normally-closed contacts 88' andclosing the normally-open contacts 88" whereby the current 'iiowithrough the coils- Qe'and HH is reversed. inv moving the arm Rsuccessively. through its three positions, the actuation of the switches'15, 7'6 and I? takesplace in the same sequence as described above, thecurrent flow, however, being through the switch 13.

It can be readily appreciated that the multiple motor drive describedabove'can be adapted to many use other than as shown for moving a strip.Further, other modi ications of the means, elements, circuits and otherdevices shown and 'described herein may be used without-departing fromthe invention The present disclosure, therefore, is to be construed inan illustrative sense, and' the scope o r-the invention is teesdetermined by the claims which. follow. 'I-I'a'vingnow-particularlydescribed our inventicn, what-we desire to secure by Letters Patent o fthe United states, and What we claim is:

1. A multiple motor drive for driving acomm'on drive'sha ft at aplurality of diner-ant speeds, the comb-ination comprising a first motoroper atively connected to said shaft and upon'energization adapted torotate said shaft at a predetermined speed, a second motor adapted u ponenergization to rotate-said sha-i-tat any one or several speeds lessthan the predetermined speed of saidfirst motor, clutch means forcoupling said second motor to therotor of said first motor, a holdingcircuit including a solenoid operatively connected to said clutch meansand a normally-open switch means in series circuit therewith and formaintaining said clutch means in an engaged position tion to rotate saidshaft at any one of several "speeds less than the predeterminedspeed olfsaid first motor, clutch means adapted t couple sai'd second motor tothe rotor of saidfirst motor upon energization of said second motor, aholding circuitincluding a solenoid operatively connected to said clutchmeans and a normally-open switch means in series circuit therewith andfor maintaining said clutch means in an engaged ,position uponenergization of said second motor, and a centriiugally operated means onthe rotor of said first motor and adapted to be actuated at apredetermined critical'speed thereof for moving said switch means to aclosed position upondeenergization of said first motor and energizationof said second motor when said rotor attains-said critical speed.

3. A multiple motor drive fordriving a common drive shaft at a pluralityof differentfspeeds, the combination comprising a first motoroperatively connected to said shaft andupon energization adapted torotate said shaft at a predeterm'ined speed, a second motor adapteduponenergization torotate said shaft at any oneof several speeds lessthan the predetermined-Speeder said first motor, clutch means adapted-tocouple said second motor to the rotor of said first-motor uponenergization of said second motor and to-r'elease said second-motor fromthe rtit'br of saiufirst motor upon energization of said first motor, aholding. circuit including a solenoid operatively connected tosaidclutch means and a normallyopen switch means in series circuittherewith and .for' maintaining said clutch means in an engaged positionuponenergization of said second motor, and a centrifugally operatedmeans on the rotor of saidv first motor and adapted to be actuated at--a predetermined critical speed thereof for permitting said switchmeans to move to said normally-open position upon energization of saidfirst motor and for moving said switch means t a clos'edpositionrupondeenergization, of said first motor and energization of said secondmotor when said rotor attains said critical speed.

4. A multiple motor drive for driving a common drive shaft at aplurality of different speeds, the combination comprising a first motoroperatively connectedto said shaft and upon energization adapted torotate said shaft at a predetermined speed, a'se'c'ond motor including aplurality of resistances 'in'seri'es circuit with the armature and heldwindings and adapted upon energization to rotate said shaft at any oneof several speeds less than the predetermined speed of said first motor,clutch means for coupling said second motor to the rotor of said firstmotor, a holding circuit including a solenoid 'operatively connected tosaid clutch means and a normally-open switch means in series circuittherewith and for maintaining said clutch means in the engaged positionupon the energiz'ation of said second motor, a centrifugal-1y operatedmeans on the rotor of said first motor i or permitting saidzswitch meansto move to said normally-open position upon energization or said firstmotor, and a control means for; engaging said second motor and forselectively energizing saidusecond motor and said first motor.

5. A multiple motor drive fordriving acommon drive shaft at a pluralityof diilcrent'speed-s, the combination, comprising a first motoroperatively connected to said shaft and upon energization adaptedtorotatersaid shaft at a predetermined speed, a second motor including aplurality of resistances and a single resistance in series circuit withthe armature and field windings and a'dapted upon energization to rotatesaid shaft "successively at a low speed and an intermediate speed,-bothof said speeds being lessthanthepredetermined speed of v:s'a'id firstmotor, clutch means for coupling said second motor to the rotorcf saidfirst motor,;a holding circuit including a solenoid operativelyconnected to saidic'lutch meansfiand a normally-open switch means inseries circuit therewith and for maintaining :said clutch means in anengaged position upon energization of said second motor, a centrifugallyoperated means on the rotor of said first motor for permitting saidswitch means to moveto said normally-open position at a predetermined:critical speed'of said rotor upon energization of said first motor,and'a control meansxincludingaaplurality'of switches adapted to besuccessivel-yactua'ted for energizing said second 111101301 at the lowspeed and the intermediate speed and said combination comprising a"first motor operativcly connected to said shaftan'd upon-energizationadapted to rotate said shaft at a predetermined speed, a second motorincluding a plurality of resistances and a single resistance in seriecircuit with the armature and field windings and adapted uponenergization to rotate said shaft successively at a low speed and anintermediate speed, both of said speeds being less than thepredetermined speed of said first motor, clutch means for coupling saidsecond motor to the rotor of said first motor, a holding circuitincluding a solenoid operatively connected to said clutch means and anormally-open switch means in series circuit therewith and formaintaining said clutch means in an engaged position upon energizationof said second motor, a centrifugally operated means on the rotor ofsaid first motor for permitting said switch means to move to saidnormally-open position at a predetermined critical speed of said rotorupon energization of said first motor, and a control means including aswitch in series circuit with said resistances, a second switch inseries circuit with said single resistance, a double pole switch havingone pole in series circuit with said first and second switch and theother pole in series with the armature of said first motor and adaptedto be successively actuated for energizing said second motor at the lowspeed and the intermediate speed and said first motor at saidpredetermined speed and to be selectively actuated for energizing saidsecond motor and said first motor, and a switch in series circuit withsaid double pole switch adapted to be selectively actuated for reversingthe direction of rotation of said motors.

7. A multiple motor drive for driving a common drive shaft at aplurality of different speeds, the combination comprising a first motoroperatively connected to said shaft and upon energization adapted torotate said shaft at a predetermined speed, a clutch member on the rotorof said motor, a gear member including a clutch face slidably mounted onsaid rotor, a second motor operatively connected to said gear member andincluding a plurality of resistances and a single resistance in seriescircuit with the armature and field windings and adapted uponenergization to rotate said shaft successively at a low and intermediatespeed, both of said speeds being less than the predetermined speed ofsaid first motor, a holding circuit including a solenoid operativelyconnected to said gear member and adapted to be energized uponenergization of said second motor for moving and holding said clutchface in an engaged position with said clutch member and a normally openswitch means in series circuit with said solenoid, a centrifugallyoperated means on the rotor of said first motor for permitting saidswitch means to move to said normally open position at a predeterminedcritical speed of said rotor upon energization of said first motor, anda control means including a switch in series circuit with saidresistances, a second switch in series circuit with said singleresistance, a double pole switch having one pole in series circuit withsaid first and second switch and the other pole in series circuit withthe armature of said first motor and adapted to be successively actuatedfor energizing said second motor at the low speed and the intermediatespeed and said first motor at said predetermined speed and to beselectively actuated for energizing said second motor and said firstmotor, and a switch in series circuit with said double pole switchadapted to be selectively actuated for reversing the direction ofrotation of said motors.

ELMER O. WANGERIN. ROBERT W. WETHERALD.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 786,421 Cutler Apr. 4, 1905854,721 Day May 28, 1907 873,064 Merrill Dec. 10, 1907 2,103,790 NasonDec. 28, 1937 2,184,344 Hemphill Dec. 26, 1939 2,444,799 Wood et a1.July 6, 1948 2,459,829 Maxwell Jan. 25, 1949

